Weight-controlled detector for looms



Jun: 28, .1927, 1,633,651 I K. J. UNWIN WEIGHT CONTROLLED DETECTOR FOR LOOMS Filed Jan. 5, 1926 Patented June 28, 1927.

' entree mm PATENT OFFICE.

KENNETH J. UNWIN, or SHREWSBURY, nassaonnsnrrs, ASSIGNOR mo cno rroN & KNOWLES LOOM wonKs, or woRoEsrrEn, MASSACHUSETTS, A CORPORATION or MASSACHUSETTS.

WEIGHT-CONTROLLED Application filed January This invention relates to improvements in multiple needle weft detectors for looms and it is the general object of the invention to render detectors'of this type lesslikely to abrade fine yarn than detectors at present in use without sacrificing precision of indicaweights at the time theyrwere engaged by the bobbin and 'where the yarn is fine and the bobbin is active for a comparatively long time the needles abrade the yarn to an ob jectionable degree. his a further object of my invention to returnthe needle detectorsto normal position after each detecting operation but to remove pressure from the needles prior to engagement with the yarn.

With these and other objects in view which will appear as the description proceeds, my invention resides in the-combination and arrangement of parts hereinafter described and set forth in the claims.

In the accompanying drawings wherein I have shown a convenient embodiment of my invention,

Fig. l is a. side elevation of a detector showing the same in the position it occupies immediately before engagement of the detectors with a full bobbin, certain parts being in section,

Fig. 2 is a horizontal section on line 2-2 of Fig. 1, and v Figs. 3 and 4. are vertical sections on lines 33 and t at of Fig. 1, respectively.

Referring to the drawings it will be seen that Ihave provided a stand 10 to which is secured a support 11 by means'of bolt 12. Said. support is provided with a rib 13 which enters a notch 1% in the lower end of a needle carrier 15. Said carrier has a rearward'ly extending portion 16 and an upwardly eX- tending portion 17 through which extend, respectively, the lower yarn engaging and upper indicating portions 18 and 19 of the needle detectors 20. The carrier 15 is prosided with spaced ears 2]. and 22 which 5, 1926. Serial No. 79,437.

form bearings for a, pin 23 on which is pivotallyn ounted a. detector with-drawing device 2et having depending spaced arms 25 of the incoming bobbin. 7 V

above the indicating ends 19 of the detectors and is given a downward movement when the bobbin B carried in the shuttle S is in the extreme forward position on each detectmg in contact with, a wing 28 said rod-moves, all of the detectors forwardly out of the path n actuating lever 29 is normally located ing beat of the loom. When yarn'is present I all of the detectors are moved forwardlyand said actuating lever moves downwardly with out interruption but when one ofthe openings 30 of the bobbin B is'uncovered the corresponding detector 20 will remain in rearward position and downwardmovement of the actuating lever is thereby prevented to give indication of weft exhaustion and effect a change in the operation of the loom. Tension spring 31 is suspended between the forwardly extending end of a bracket 32 secured to the carrier 15 and a pin33 held by the tension of the. spring against the rear face of the support 11. The spring affords a yielding means to hold the detector in normal position'lbut permits the carrier '15 to move forwardly when engaged by an improperly placed bobbin. The matter thus far described is of common construction and forms no part of my invention. Y

Here-tofore it has been usual to. provide some device for holding the detectors 20 in.

rearward position and these devices have comprlscd either a single spring device held in contact with all of the detectors or 'indi vidual weights, one for each detectorfdepending uponthe class of work to be done by the detectors. Of these two means for returning the detectors the spring device is somewhat more sensitive because of the fact that on an indicating beat of the loom the non-indicating detectors move forwardly and carry the spring device away from the detecting needle and the latter is held in rearposition merely by its weight and the friction against sliding in carrier 15. In such a device, however, where the yarn is fine the detectors are found to abrade the yarn because of the pressure of the spring device and my invention relates to a device for returning all of the detectors to normal position after each detecting beat of the 100111, so arranged that the means is moved out of engagement with the detectors prior to contact of the yarn and detectors. In this way the yarn is not subjected to the pressure present in that form of detector which employs the spring device or weights.

In carrying out my invention I pivot a Weight 50 on the pin 23 and provide said weight. with an arm 51 positioned for engagement withthe intermediate portion 52 of all-shaped controller 53. Said controller 53 is provided with a pair of parallel legs on the rear end of each of which is adjustably, mounted a nut 54 positioned for engagement with a hunter 55 on the binder A on the. lay L. The carrier 15 is provided with upwardly extending-lugs 56 which are recessedzas at 57 to form guides for the legs of; the controller The weight 50 is mountedfor-free pivotal motion on the pin 23 and the connecting portion 52 lies in front of the upright portions of the detectors 20.

In operation as the lay moves forwardly the hunter on the binder will engage the nuts 54 and the controller willbe moved forwardly tov move the connecting portion 52 thereofaway from the upright portions of the detectors, this motion also moving the weight50 forwardly from the full line to the dotted line position shown in Fig. 1. The, bobbin then engages the detectors, whichflexert'verylittle pressure on the yarn because of the fact that the weight is moved away from the detectors. As the lay recedes the weight '50 will return the controller to the rear position indicated in Figs. 1 and 2 and inasmuch as the connecting portion 52 extends-in front ofthe detectors the latter will-also be returned to their. normal full li-neposition shown in Fig. 1.

From the foregoing it will be seen that I have provided a weft detector returned to operative position by a device which is moved out of operative relationship with the detector prior to engagement of the latter with the yarn to be detected so that the detectors may exert a minimum of pressure against the yarn.

Havingthus described the invention it will be apparent that changes and modificationsmay be made therein by those skilled in the art without departing from the spirit and scope of the invention, and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a'weft detector for looms, a detecting element having; a movement which it derives from the moving yarn tobe detected, means to return the detector to normal detecting position, and mechanism other than the detector to move said means out of operative relationship with the detector member prior to engagement of the latter with the yarn to be detected.

2. In a weft detect-or for looms, a detector element having a movementwhich it derives from the moving surface to be detected, means to return the detector to normal detecting position, and mechanism operating independently of the detector to move said means out of operative relationship with the detector prior toengagement of'the-latter with the surface to be detected.

3.- In a weft detector for looms, a lay, a detector mounted for longitudinal movementto be engaged by the surface to be detected,- means to return the detector to normal position after a detecting movement, and controlling mechanism independent of the detector having a-portion interposed between the means and the detector, said mechanism to be engaged by the to move the means away from the detector on-a for wardmovement of the: lay, said controller being returned on'the backward stroke of the lay by the means and said portion returning the detector to normal detecting position.

l. In a weft detector for looms, a lay, a plurality of longitudinally movable detectors movable forwardly withthe surface to be detected, means to return said detectors to normal detecting position after a detecting movement, andmechanism engaged by the lay and independent of the detectors and having a portion thereof located between the detectors and the means,.whereby said means is moved away from the detectors on the forward movementof the lay and said detectors arelmoved to normal position on the rearward movement of the lay.

5w In a weft detector for looms, a lay, a plurality of longitudinally movable detectors positioned for engagement with the surface to be detected, a U-shaped controller to be engaged by the lay and having a portion thereof located in front of the detectors, and means normally acting on the controller to move the same rearwardly, the lay engaging. the controller on the forward movement thereof to move the detectors and controller forwardly independent of the detectors and prior to engagement of the latter with the surface to be detected, said means and eon troll'er acting on the backward stroke of thelay to return the detectors to normal. detecting posit-ion.

6. In a weft detector for looms, a lay, a plurality of longitudinally slidable detectors positioned to engage the surface to be detected, a carrier for-said detectors, a weight freely pivoted on said carrier, and a U- shaped controller guided on said carrier and positioned for engagement with the lay to move said weight forwardly prior to engagement of the detectors with the surface to be detected, the intermediate portion of the U-shaped controller extending between the detectors and the weight whereby upon backward movement of the lay the weight and controller will return the detectors to normal detecting position.

In testimony whereof I have hereunto aflixed my signature.

KENNETH J. UNWIN. 

